That's certainly a possibility (one that hopefully wont happen!).
But you've also got to think of all the riders there going for yellow who dont have as strong a TT as Wiggins, Evans or Menchov, they NEED to go for broke in the mountains to make up as much time on the stronger TT guys as possible. Whether they can make enough time to defend depends on how aggresive they want to be.
That said, Wiggins has looked like a world class climber in the last ten months or so and i'd be surprised to see him getting dropped that often (especially with the unbelievably strong team he has with him), who knows, he might even try something himself!
I'm calling Wiggins, Froome, Porte and Rogers to team up and do something like this:
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